Logged into my account to check, and they kindly told my today that they will be closed for Christmas... for 2009.
From: A Message from AT&T
Received: 09/12/2010 6:12 PM
In observance of the holiday, our Consumer Call Centers will be closed on Christmas Day, and will re-open at 9am local time on 12/26/2009. Business Call Centers are open. Additional customer service options, including self-service, are available by calling 800-331-0500 or 611 from your wireless phone.